Internal grinding machine



7 June 18, 1935. H. H. ASBRIDGE INTERNAL GRINDING MACHINE Filed Dec. 14, 1934 2 Sheets-Sheet l June 18, 1935. H. H. ASBRIDGE 2,005,332

INTERNAL GRINDING MACHINE Filed' Dec. 14, 1934 2 Sheets-Sheet 2 Patented June 18, 1935 1 mamnycnmnme Harry Hales lisbridge; Ashton-on- Mersey, 1 land, assignor' to. The Churchill MachineTool 1 Company Limited, Broadheath, England, a

British company Application December- 14, 1924', swarm; 757,572 In GreatBritain Jul'y lil, 1933 I I v 2 Claims l. 151-95) I I This invention relates to internal grinding-machines and has for its'object'to provide means for-so controlling and regulating the operation of such machines as to increase-the rate of pro- ;& duction of the machines and toadaptthe'latter for the economical 'and eflicient'internal' grind feed compensation forwheel wear; the reversal of the worktable andthe-disconnection of l the drive to-the mechanically timed cycle.

planatory drawings:

Figure 1 is a front view of an 'internal'grind ingmachine constructed and arranged in one 25, gonvenient form in accordance with this inven- 1on. 1Figure 2 is a sectional view throughthe cross ,side:

Figure 3 is aside fview (looking from rightto 30. left of Figure 1)' ofthe portion of the grinding head having thereon the means for controlling the motion for adjustment of wheel wear.

Figure 4 is a side view (looking from left to right of Figure l) of the means upon the grind- 35 ing head for automatically stopping the cycle of operations.

Figure 5 is a cross sectional view showing the diamond truing device for the grinding wheel.

The work carrying table a. is traversed by Referring to the'accompanying sheets ofex- 40 the hydraulic ram or plunger 1; until the stop c' engages the abutment d when the table is given short reciprocations by the oscillationfof the frame 6 (pivoted at ,f) by the connecting rod g and crank pin h. This arrangement of oscil- 45 lating stop is described and claimed in myprior application for patent No. 733,676/34;

When the table has moved a short'distance from ofa'hydrauli-c' plunger in a cylinder The service position ofthe, diamond is shown infull lines 'y ure'fi in contactiwith'the grinding wheel m and 'the out-of-service position in dotted-lines. A

v The work-piece, the internal surface ofwhich is to be ground,-is indicated in dotted lines at n inFigure 1. {It is suitablysupportedupon the head or faceplate 0 which is rotated in any convenient manner;

' Upon the table'a are two dogs 1:: andq, the

latter being adaptedlto engage a lever which putsthe hydraulic control handle 8 into-a mid or neutral position to bring the machine to rest 1 when the table a has reached its extreme left hand position; The dog p engages a lever it '"(see Figure 4) upon aspindle u, to which are secured' armsocarrying a drop worm w. The I drive from u, to w is by the gear .wheels u a to the worm shaft. The lever had a rod :1: pivote'd thereto which passes through a fixed member-y with a locking slide 2 thereon. There I is arecessed'part upon' the rod' :1: which is en'- gaged'by" the slidez when the latter is in its righthand position, Figure 4, sothat the slide holds. up the rod a and thereby maintains the lever t in a position in which the worm w engages the worm wheel 2. The latter is keyed upon a spindle 3 which has a face cam 4 splined thereonythec'ross slide S'carrying the grinding head 6 having a-pin l thereon which bears against'the 'cam 4 under the pressure of the weight 8. A wheel 9 with dogs or tappets thereon is also secured upon the spindle 3. One tappet l0 upon the wheel 9 is adapted'to engage a plunger II for thepurpose of turning a lever l2 coupled by the rod I3 to the starting handle s and to the lever r, the turning of the lever I2 I putting the handle into its left hand position (it is shown in its mid or neutral position) to reverse the direction of movement of the table a, as hereinafter described. A second tappetl4 upon the wheel 9 (see Figure 3) engages a ratchet wheel I! turns a worm l8 (see Figure I i '2) and through it a worm wheel 19 upon a bearsliding rod I5 which by means of a pawl l6 and The handle s controls the supply of hydraulicfluid from the pump 23 to therespective -ends of the cylinder containing the the table a is traversed. V

The operation of the machine follows:- I

The operator secures his work-piece asn upon the face plate and then moves the handle s to the right from its mid positionas shown.

This results in hydraulic fluid being supplied to the left hand side of the piston 24.7and, thetable a is thereby traversed towards the right. Aslthe. table approaches its right hand; position, atappetdi thereon causes pressure fluid to be supplied to the cylinder is so'thatthe truing diamondctis brought into operative position and traversed over the grinding wheel m. Thereafter thepressure fluid" is released from the cylinder is and'the diamond tool'returned to its out-of service position. V The dog 1: now engages the lever t; and causes the worm w to'be raised into engagement with the worm wheel 2. V

The table a is now arrested by the stop c. The wormv wheel 2 turns the spindle 3 and so the feed cainj to control the feed to the grinding wheel, The wheel} upon the spindle- 3 is also being turned and in succession it causes (1) by the: tappet I4 and the nut 2| to have a small axial movement to give an additional feed move-. ment to the grinding wheel asbefore described, (2) ,by the;tappet Ill the starting handle s to be moved to the left to reverse the table a,,,and (3) by the tappet 22,the rod :1: to be released todisconnect the-worm drive w, 2. The dog q returns the handle s to its midposition. The machine is now at rest with the work head in its original position: for. the removal of the workpiece and the substitution of a fresh work-piece. :It :will be notedpthatonce the operator, has started the, machine by the handle s,'the operationsproceedin'a mechanically timed cycle until 1 themachine is at its original startingpoint.

piston ltd bywhich' the bed, a handle controlling the traverse of the table and having forward, reverse and neutral positions, a cross slide upon said bed, a grinding head upon said cross slide, a cam controlling the feed movements of said slide, a shaft turning said cam, means acting on said. cam for progressively increasing the limit of feed movement imparted by said cam in order to compensate for grinding wheel wear, a dog upon the? table, an arm operatively connected to said handleandadapted to be engaged by said dog to bring the 'worktable to rest, a second dog upon the table, driving means for the said shaft, means whereby said second dog couples up said driving means tosaid shaft, a tappet wheel upon said shaft, tappets upon said wheel, one tappet actuating the means aforesaid for progressively {increasing the limit of the feed movement of the cross slide, a second tappet actuating the 'handle to put it in its reverse position, and a third tappet disengaging the drive to said shaft when-thetappet wheel has made one turn.

2. Inaninternal grinding machine, in combination, -a bed, a worktable traversible upon the 'bed,-a-hydraulic cylinder upon the bed, a piston insaid cylinder connected to said worktable, a hand valve controlling the flow of hydraulic fluid to the opposite ends of said cylinder, a cross slide, a grinding head upon said cross slide, a cam controlling the feed movement of said slide, a weight holding the slide against the cam, a shaft turning said cam, a tappet wheel upon said shaft, means for progressively increasing the limit of thefeed movement of the slide to compensate for wheel wear, a dog upon said worktable, an arm operatively connected to the hydraulic; fluid control valve adapted to be engaged by said dog to bring the worktable to rest,a second dog upon said worktable, a driving meansfor'said shaft, means whereby said second dog makes said driving means operative, tappets upon said tappetwheel, one tappet actuating" the means aforesaid for progressively increasing the limit of the feed movement, of the slide, a lever operatively connected to said bydraulic fluid control valve and adapted to be engaged by a'second tappet to reverse the said valve, means maintaining the drive to the shaft after ithas beenestablished, and a third tappet uponsaid tappet 'wheel for releasing and dis- 5O connecting said drive when the tappet wheel has made one turn.

' HARRY HALES ASBRIDGE. 

